^^&&^^

Edit File: flush-hang.result

#
#Bug #21133329   HANGING "SYSTEM LOCK" WHEN EXECUTING "FLUSH TABLE ... FOR EXPORT"
#
CREATE TABLE t1 (
c1 BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
c2 BIGINT,
c3 VARCHAR(2048),
c4 VARCHAR(2048),
INDEX idx1(c2),
INDEX idx2(c3(512)),
INDEX idx3(c4(512))) Engine=InnoDB;
CREATE TABLE t2 ( f1 int PRIMARY KEY) engine=innodb;
SET GLOBAL INNODB_PURGE_STOP_NOW=ON;
SET GLOBAL innodb_disable_background_merge=ON;
SET GLOBAL innodb_stats_persistent=OFF;
show variables like '%innodb_stats_persistent%';
Variable_name	Value
innodb_stats_persistent	OFF
innodb_stats_persistent_sample_pages	20
INSERT INTO t1(c2, c3, c4) VALUES
(1, REPEAT('a', 2048), REPEAT('a', 2048)),
(2, REPEAT('b', 2048), REPEAT('b', 2048)),
(3, REPEAT('c', 2048), REPEAT('c', 2048)),
(4, REPEAT('d', 2048), REPEAT('d', 2048));
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
INSERT INTO t1(c2, c3, c4) SELECT c2, c3, c4 FROM t1;
FLUSH TABLES t2 FOR EXPORT;
UNLOCK TABLES;
SET GLOBAL innodb_disable_background_merge=OFF;
SET GLOBAL INNODB_PURGE_RUN_NOW=ON;
SET GLOBAL innodb_stats_persistent=ON;
DROP TABLE t1,t2;